I try to activate all Uart and Usart ports.
When I boot the board I see that some of them are not usable.
I tried also to activate them one by one and in this case ports are ok, when they are enabled one by one all of them works correctly individually.
but for example if the uart1 the uart3 is activated in same time the uart3 is not available anymore.

Linux kernel version is 4.9.40 and AT91bootstrap 3.8.8.

Somebody have any experience to activating all serial ports on SAMA5D27 ?

dcresearch wrote:Somebody have any experience to activating all serial ports on SAMA5D27 ?

Is this an all or nothing proposition?

You seem to have reduced the problem to a simple case (e.g. UART1 and UART3), so how long are you going to wait for a response before you investigate deeper than determining a port "is not available anymore" (whatever that means)?

dcresearch wrote: .dts file is below.

For what configuration?
What you have posted is almost unreadable; learn to use the code block to preserve indentation.
It's not a valid Device Tree file; the braces are obviously mismatched.
Is this the output from the preprocessor? Why?
A search of this "dts" finds no nodes for any U[S]ARTs.